Sleep, mood & depression

Without enough sleep, adults can find it harder to control their emotions and behavior. Sleep-deficient children may feel angry, sad or unmotivated, or have mood swings.

Sleep deficiency changes activity in some parts of the brain, which may help explain these effects.

Depression can bring trouble sleeping, waking very early, or sleeping too much, along with tiredness and low energy.

In a trial of older adults with insomnia, treating their sleep with CBT-I halved the chance of developing depression over the next two years.

Difficulty getting to sleep or staying asleep is reported by about three-quarters of people with depression.

If night-time thoughts are keeping you up, the “Racing mind at night: anxiety & sleep” guide has tools for quieting them.

Middle-of-the-night waking or very early waking is one way depression can show up, especially in middle-aged adults.

If you keep waking very early and feel low, it’s worth mentioning to your clinical provider.

Sleeping too much (hypersomnia) is present in about 40% of young adults with depression, and is more common in women.

Oversleeping can also be part of a winter pattern of low mood. See the “Seasons, light and mood” section.

Fatigue, lack of energy and feeling slowed down are common in depression. You can sleep for hours and still not feel rested.

Tiredness has many causes, including sleep apnea and other health conditions. A provider can help work out what’s going on. See the “Sleep apnea & your mental health” guide.

Older teens with depression may feel unusually sleepy during the day.

Teens can be sleepy for lots of reasons, so sleepiness alone isn’t a warning sign. Watch for it alongside changes in mood, friendships or interest in things they used to enjoy.

Insomnia in people without depression is a known risk factor for later depression.

This doesn’t mean a bad patch of sleep will lead to depression. It means persistent sleep trouble deserves care, not just “pushing through.”

Ongoing insomnia is one of the most common leftover symptoms when depression only partly improves. Sleep problems that linger are linked to a higher chance of depression coming back.

For some people, the first sign of a dip is waking early. For others it’s wanting to sleep all weekend. Noticing your pattern can help you reach out sooner.

The “Sleep & mood check-in” worksheet can help you spot links over a few weeks.

A regular wake time helps set your body clock, which supports both sleep and mood.

It’s okay to start small. If you usually get up at noon, try 11:30 for a week, then 11.

Scheduling pleasant activities, called behavioral activation, is part of CBT for seasonal depression.

Ideas: coffee on the porch, a favourite song, a text to a friend, feeding the birds. Small is fine. Doing comes first; feeling better often follows.

Just 30 minutes a day of walking can help boost your mood. You can split it into shorter walks.

Staying physically active is also one of the CDC’s healthy sleep habits.

Long or late naps can make it harder to sleep at night. The “Sleep & mental health” guide has tips on napping smart.

Lack of sleep makes emotions harder to manage, so thoughts in the middle of the night can feel heavier than they would in daylight.

Try telling yourself: “I’m tired and it’s dark. I’ll look at this again in the morning.”

Keep a notebook by the bed. Write a line or two, then close it. The “Racing mind at night: anxiety & sleep” guide has more ways to settle a busy mind.

A soft blanket, a calming playlist, a warm drink without caffeine, or a pet nearby can make nights feel less lonely. The “Breathing for sleep & rest” guide has gentle breathing for the middle of the night.

In the more common winter pattern, people often sleep too much and feel sleepy, especially as days get shorter.

In summer-pattern SAD, trouble sleeping is common. Long daylight hours, short nights and heat may play a part, though these ideas haven’t been fully tested.

Light therapy means sitting in front of a very bright light box (10,000 lux) for about 30 to 45 minutes each morning, usually from fall to spring.

Some people with certain eye conditions or sensitivities need medical guidance, so talk with your clinical provider before you start.

CBT for SAD works on season-related negative thoughts and schedules pleasant activities. In a direct comparison, it worked about as well as light therapy, and its benefits seemed to last longer.

In older adults with insomnia, two months of group CBT-I halved the chance of new or returning depression compared with sleep education. It worked even for people who had been depressed before.

Online CBT-I has also been shown to ease low mood and anxiety along with sleep.

The “Insomnia & trouble sleeping” guide explains how CBT-I works and where to find it.

CBT helps people challenge and change unhelpful thoughts and behaviors. IPT focuses on relationships and life events that affect mood.

A regular bedtime and wake-up time, regular nutritious meals, and daily walking can all support mood.

People with depression are advised to avoid alcohol, nicotine and drugs. For sleep, it helps to skip alcohol close to bedtime.

Staying connected and talking with trusted people is one of the self-care steps that can help with depression.

Peer support groups, faith communities and community centers can offer a place to feel less alone.

Try: “I’ve noticed you’ve been sleeping a lot and seem tired. How are you doing, really?” Listen more than you talk.

“Want to grab coffee and walk around the block?” is easier to say yes to than “You need to get out of bed.” Walking can help mood.

Making a call can feel huge when someone is low and exhausted. Offer to sit with them while they book, or drive them to the appointment.

If they mention suicide or seem hopeless, ask directly and stay with them. Call or text 988 together, or call 911 if they are in immediate danger.