How to Use a Sleep Timer — and Whether You Actually Should

What is a sleep timer?

A sleep timer is a countdown timer set to turn off audio or video playback after a fixed duration — typically 15 to 60 minutes. The idea is to provide ambient sound while you fall asleep, without leaving audio playing all night.

Sleep timers are built into most music apps, smart speakers, televisions and podcast players. You can also create one manually using any countdown timer — including GlowClock's free timer — to signal when to turn off your device.

How to set a sleep timer using GlowClock

1. Go to glow-clock.com and click the Timer tab
2. Enter how long you want the audio to play (e.g. 30 minutes)
3. Switch to GlowClock's Sleep & Night Clock mode — the amber display won't disrupt your melatonin production
4. When the GlowClock alarm sounds, turn off your audio device and go to sleep

Alternatively, most streaming apps have a built-in sleep timer in their settings menu — look for "Sleep Timer" or "Timer" in the app's playback controls.

Does falling asleep to audio help or hurt sleep?

This depends on what you're listening to and your personal sleep patterns. The research gives a mixed picture.

Potential benefits

• Masking disruptive noise — consistent background sound (white noise, brown noise, rain) can reduce the impact of sudden environmental noises that cause arousal
• Reducing anxiety — for people whose minds race at bedtime, a gentle audio stimulus can redirect attention away from anxious thoughts
• Sleep association — over time, a specific sound or audio routine can become a conditioned sleep trigger

Potential drawbacks

• Sleep dependency — if you always need audio to fall asleep, you may struggle to sleep without it (in hotels, shared rooms, etc.)
• Audio with language activates the brain — podcasts, audiobooks and talk radio stimulate language processing centres, which can delay sleep onset and reduce deep sleep quality
• Screen light is the real problem — if you're watching video to fall asleep, the blue-spectrum screen light suppresses melatonin regardless of the sleep timer. Turn the screen off before closing your eyes.

The role of light — why your device matters as much as the audio

The biggest sleep timer mistake people make is watching video on a bright screen and expecting a sleep timer to mitigate the impact. The light emitted by a phone, tablet or TV in a dark room is a powerful melatonin suppressant — telling your brain it's daytime and delaying sleep onset by 30–60 minutes even when you're physically tired.

If you must use a screen near bedtime, enable Night Shift or a warm colour filter. Or better yet, switch to an amber-toned night clock that provides visible time without blue-spectrum light — set a countdown timer on it, put your phone face-down, and let the audio play until the alarm.

Recommended sleep timer durations

• 15–20 minutes — if you usually fall asleep quickly; minimises total audio exposure
• 30 minutes — the most common sleep timer duration; works for most people
• 45–60 minutes — if you have difficulty falling asleep or experience significant anxiety at bedtime

Avoid setting sleep timers longer than 60 minutes. Audio playing during sleep — particularly language-based content — can disrupt the lighter sleep stages and reduce sleep quality even if you're not consciously aware of it.

Sleep timers for naps

Sleep timers are also useful for managing nap duration. Set a 20–25 minute countdown before lying down — this is long enough for a restorative light sleep nap without entering deep slow-wave sleep (which causes grogginess on waking, known as sleep inertia). The alarm wakes you at the right moment and prevents the nap from extending into your nighttime sleep budget.

A sleep timer is most useful as a boundary-setter, not a sleep aid. It ensures audio stops at the right time — but the quality of your sleep depends on everything that happened in the hours before you lay down.