How Does Night-Shift Work Affect Mental Health and Substance Use?

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Your Health Magazine Contributor

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How Does Night-Shift Work Affect Mental Health and Substance Use?

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Night work does not automatically cause a mental health or substance use disorder. It can, however, create conditions that make both harder to manage. 

Working while the body expects sleep may reduce sleep time, disturb circadian rhythms, limit social contact, and increase fatigue. Some workers then lean on caffeine or stimulants to stay alert and alcohol, cannabis, or sedating medication to come down. What starts as a workaround can become a cycle.

The problem is especially relevant in 24-hour communities. 

Health care staff, first responders, hospitality workers, security personnel, drivers, warehouse employees, and casino workers may all rotate between work and sleep at hours that conflict with family schedules and daylight. 

Protecting mental health begins with recognizing the strain as an occupational reality, not a personal weakness.

Sleep Loss Changes More Than Energy

Night-shift workers often get less sleep and poorer-quality sleep than day workers. Morning light tells the brain to become alert, just as a night worker is trying to wind down. Household noise, errands, appointments, and caregiving can shorten the available sleep window even more.

Sleep loss affects attention, reaction time, emotional regulation, and judgment. The National Institute for Occupational Safety and Health notes that extended wakefulness can produce performance impairment comparable to alcohol intoxication. 

Combining sleep deprivation with alcohol can reduce performance further, a serious concern for anyone driving home or doing safety-sensitive work.

Mood can shift too. A tired person may become more irritable, anxious, flat, or reactive. Repeated schedule changes also make it difficult to maintain exercise, meals, therapy appointments, mutual-aid meetings, and time with supportive people. Those disruptions do not prove a disorder, but they can remove several everyday protections at once.

The “Up for Work, Down for Sleep” Loop

Caffeine can improve alertness for a time, but late-shift use may still be active when a worker reaches bed. Energy drinks can deliver large amounts quickly, and using more to overcome chronic sleep debt may lead to shakiness, headaches, palpitations, or greater anxiety.

Alcohol may feel like an efficient off-switch after a stimulating shift. It can make a person drowsy while still fragmenting sleep and causing earlier waking. The result may be a shorter, less restorative sleep period, followed by more caffeine before the next shift.

Some people use cannabis, non-prescribed stimulants, benzodiazepines, or extra doses of medication to control alertness and sleep. That adds risks related to impairment, dependence, drug interactions, and inconsistent dosing. A prescribed medication should be taken only as directed. Changes to sleep, psychiatric, or substance use medication belong in a conversation with the prescriber.

Warning Signs the Pattern Is Becoming a Health Problem

Look beyond which substance is being used and ask what role it has taken. A pattern deserves attention when someone:

• feels unable to begin a shift without a substance or end one without another
• uses increasing amounts to get the same effect
• drives while drowsy, intoxicated, or uncertain about impairment
• misses work, makes preventable errors, or receives repeated safety warnings
• hides use, combines substances, or takes medication differently than prescribed
• feels depressed, panicked, unusually suspicious, or emotionally numb
• repeatedly tries to cut back but cannot maintain the change

Shift-work sleep disorder can involve persistent insomnia when sleep is available, excessive sleepiness during work, or both. Other conditions, including depression, anxiety, sleep apnea, medication effects, and substance use, can look similar. A clinician can help sort out the cause instead of treating every symptom as a scheduling problem.

Build a Sleep Window That Other People Can See

The most helpful sleep plan is one that the household and work schedule can realistically support. After a night shift, go to bed as soon as practical. A cool, quiet, very dark room can reduce daytime interruptions. Blackout shades, an eye mask, earplugs, or white noise may help. Silence notifications and tell household members which hours are protected.

If possible, keep the main sleep period at a similar time across consecutive workdays. A planned nap before a shift may increase total sleep, though a person should allow time to feel fully alert before driving or starting hazardous tasks. Bright light during work and reduced light on the trip home can help some workers, but anyone with a sleep or eye condition should ask a professional for individualized guidance.

Employers also influence risk. Predictable schedules, adequate recovery time between shifts, rest breaks, safe transportation options, and a culture that permits workers to report fatigue can do more than individual willpower.

Make Substance Use Visible and Measurable

For two weeks, record shift times, sleep, caffeine, alcohol, or other substance use, mood, and near-miss safety events. Include timing, not only quantity. A drink immediately before daytime sleep has a different relationship to the schedule than one on a day off. The record can reveal whether anxiety follows energy drinks, drinking follows difficult shifts, or short sleep predicts stronger cravings.

Choose one change that can be measured. Examples include moving the last caffeinated drink earlier in the shift, creating alcohol-free wind-down routines, or arranging a ride when too tired to drive. If stopping a substance could cause withdrawal, get medical advice first. Alcohol, benzodiazepine, and some other withdrawal syndromes can be dangerous.

Treatment Has to Fit a Nontraditional Clock

A useful assessment should cover sleep, work demands, mental health, substance use, medical conditions, and current safety. Treatment may involve behavioral therapy, medication when appropriate, sleep-focused care, peer support, or a combination. Scheduling matters. A plan that assumes every person is awake and available at 10 a.m. may fail a worker whose shift ended at 7 a.m.

Icarus Behavioral Health Nevada is an accredited treatment center that offers mental health treatment in Las Vegas through residential, partial hospitalization, intensive outpatient, and outpatient services for most major diagnoses as well as co-occurring concerns. A professional evaluation can help identify the right level of support and a schedule that protects both treatment participation and recovery sleep.

Night work may be necessary, valued, or financially important. The goal is not to blame the schedule or the worker. It is important to notice when fatigue, mood symptoms, and substance use are reinforcing one another, then change the loop before an error, health crisis, or job loss forces the issue.

This article is for educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment.

References

Angerer, P., Schmook, R., Elfantel, I., & Li, J. (2017). Night work and the risk of depression: A systematic review. Deutsches Ärzteblatt International, 114(24), 404-411. https://doi.org/10.3238/arztebl.2017.0404

National Institute for Occupational Safety and Health. (2020, March 31). Impairments due to sleep deprivation are similar to impairments due to alcohol intoxication. Centers for Disease Control and Prevention. https://www.cdc.gov/niosh/work-hour-training-for-nurses/longhours/mod3/08.html

National Institute for Occupational Safety and Health. (2020, March 31). Coping with the night and evening shifts: Sleep. Centers for Disease Control and Prevention. https://www.cdc.gov/niosh/work-hour-training-for-nurses/longhours/mod9/05.html

Xu, M., Yin, X., & Gong, Y. (2023). Lifestyle factors, shift work, and depression and anxiety. JAMA Network Open, 6(8), e2328798. https://doi.org/10.1001/jamanetworkopen.2023.28798