Evidence-backed habits

7 Things You Can Do
Tonight to Sleep Better

Knowing your bedtime is step one. These evidence-backed habits help you actually fall asleep when you hit the pillow, stay asleep, and wake up at your target time feeling rested.

A calm dimly lit bedroom prepared for a restful night of sleep
Wind-Down Habits

Before Bed: Habits That Actually Work

Your brain needs a transition from active day mode to ready-to-sleep mode. These steps help you make that shift reliably, night after night.

7 actionable tips you can start using tonight
Consistency

Set a consistent bedtime and stick to it, even on weekends. Irregular sleep times confuse your body clock and make it harder to fall asleep. Your circadian rhythm runs on regularity.

Light

Dim the lights in your home 60 to 90 minutes before your calculated bedtime. Bright light suppresses melatonin, the hormone that signals sleep. Warmer dimmer light helps your body start the transition.

Phone

Put your phone face-down and switch it to Do Not Disturb at least 30 minutes before bed. The content keeps your brain alert and the notifications break early sleep. Place it across the room if you can.

Temperature

Keep your bedroom cool. Most sleep researchers point to 65 to 68 degrees Fahrenheit (18 to 20 degrees Celsius) as the ideal range. Your core body temperature needs to drop slightly to initiate sleep.

Caffeine

Avoid caffeine after 2 PM. Caffeine has a half-life of roughly 5 to 6 hours, meaning half of a 3 PM coffee is still active at 8 PM. Tea, energy drinks, and dark chocolate all count.

Wakefulness

If you cannot fall asleep within 20 minutes, get up and do something calm in low light until you feel sleepy. Lying awake trains your brain to associate the bed with wakefulness, which makes the problem worse over time.

Alarm

Use the same wake-up alarm every day. Consistent morning rise times anchor your entire sleep schedule. Even a single late morning can push your next bedtime back by an hour or more.

Sleep Architecture

Why 90-Minute Cycles Change Everything

One sleep cycle lasts roughly 90 minutes and moves through three distinct stages: light sleep, deep (slow-wave) sleep, and REM. Each stage serves a different biological purpose.

Waking up mid-cycle is what causes that heavy groggy feeling. A well-timed alarm or a natural wake at the end of a cycle feels immediately clear-headed.

90 min per cycle
5 cycles in 8 hours
20% of sleep is REM
One full night (8 hours)
~2.6 hr
~1.2 hr
~1.0 hr
Sleep Questions

Answered Simply

Short, direct answers to the questions people ask most often about sleep duration, quality, and timing.

How many hours of sleep do adults actually need?
Most adults need 7 to 9 hours. 8 hours is the most commonly cited target. Anything consistently below 6 hours is associated with reduced concentration and reaction time, even if you feel adjusted to it.
Is it better to sleep fewer hours but at consistent times?
Consistency matters a lot, but so does total duration. Both are important. Consistent timing without enough hours still leaves you sleep-deprived. Aim for the full recommended duration at a fixed schedule.
What is a sleep cycle and why does it matter?
One sleep cycle lasts roughly 90 minutes and moves through light sleep, deep sleep, and REM. Waking mid-cycle causes grogginess. 8 hours covers about 5 full cycles, which is why it is the most widely recommended target.
Does lying in bed but not sleeping count as rest?
Physically, somewhat. But mentally, sleep is irreplaceable. Restful lying-down does not replicate the memory consolidation and cell repair that happen during actual sleep stages, particularly deep sleep and REM.
Can you catch up on lost sleep at the weekend?
Partially, but not fully. A chronic weekday deficit cannot be completely erased by sleeping in on Saturday. Recovery sleep helps with fatigue, but some cognitive effects of sleep debt persist. Consistent nightly sleep is far more effective.
How does travel across time zones affect sleep?
Your circadian rhythm is tied to your home time zone. Crossing zones disrupts it, causing jet lag. Allow roughly one day per time zone crossed for your body clock to fully adjust. Our calculator lets you set any IANA time zone to plan ahead.

Put These Tips to Work Tonight

Start with the simplest step: find your exact bedtime using the calculator, then build your wind-down routine around that target time.

Free, instant, and works anywhere in the world.

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