Why You Can't Switch Off at Night

You've had a long day, you're ready for bed, but when you finally lie down, your mind starts running through tomorrow, replaying the day, jumping from one thought to the next.

It can feel like your body is tired, but your mind is wide awake.

It's a common experience: getting into bed tired, struggling to switch off, and wondering why falling asleep feels harder than it should.

Why This Happens

Sleep isn't a switch you flip. It's a gradual transition between two states.

During the day, your body runs on alertness, driven in part by cortisol, your main stress hormone. As evening arrives, cortisol naturally falls, melatonin rises, and your body starts preparing for sleep.

But that transition needs time and the right conditions. If you go straight from work, rushing around, screens, mental to-do lists, and everything else on your mind to lights out, lying down doesn't necessarily mean your brain is ready to slow down.

Your body might be ready for sleep, but your brain stays alert. So you lie there, waiting for your brain to catch up.

Start the Wind Down

Creating the right cues in the evening can help signal that the day is coming to an end.

Try giving yourself around 30 minutes of low-stimulation time before bed. Read, stretch, drink an herbal tea, or do some other slow, quiet activity you enjoy. The specifics matter less than the consistency.

Repeating the same routine each night can become a familiar signal that it's time to wind down.

Notice how the idea isn't trying to force sleep; it's giving your brain the space to slow down.

Watch the Light

Light is the strongest signal your body uses to regulate its internal clock. Bright light in the evening tells your brain it's still daytime.

Dim the overhead lights after dinner and use lamps instead. Warm, incandescent-style lighting creates a calming ambience and a more sleep-friendly setting, while bright, cool-toned lighting keeps the brain in daytime mode.

Morning daylight matters just as much as nighttime lighting. It helps set your body clock at the start of the day, influencing when your body begins preparing for sleep at night.

Move Screens Earlier

The blue light emitted from phone screens is also recognised as daylight. You can turn on a red light filter to reduce this, but the issue isn't just the light coming off the screen. It's what's on it.

Scrolling, watching content, and consuming information keeps your mind engaged at the exact point you want it winding down.

Try setting a cut-off around half an hour before bed, and leave your phone somewhere other than the bedside table.

Cool the Room

Temperature affects how easily you settle, too. Your body temperature needs to drop slightly for sleep to begin, so a bedroom that's too warm works against that.

A cooler room, lighter bedding, or a warm shower before bed all make it easier to drift off.

Building the Routine

Your body responds to patterns, so make your evenings predictable.

Going to bed and waking up at similar times, following a familiar wind-down routine, and consistently being mindful of light, screens, and room temperature all help reinforce your body's natural rhythm.

Alongside these foundations, some people choose to support relaxation with natural compounds. Reishi has been traditionally used to promote calm and balance, making it a natural addition to an evening routine.

Better sleep starts before you get into bed. Give your body the signals that the day is over, and give yourself time to slow down.

Disclaimer: It is important to consult a health professional before taking supplements if you have a health condition, are taking medication, are pregnant, or nursing.

Written by George Jackson, MBiolSci, a health writer and wellness educator focused on longevity science and lifestyle medicine. Follow him on Instagram @preventiveperspective.