Best Blackout Blinds for Baby Sleep

By Angelica Videla — Certified Baby and Toddler Sleep Consultant, London | Supporting families across the UK, Europe, US, and Australia

Why darkness matters so much for baby sleep

Light is the most powerful regulator of the circadian rhythm — the internal body clock that drives sleep and wake cycles. When light hits the retina, it suppresses melatonin production. Melatonin is the hormone that signals to the brain that it is time to sleep.

For babies, this effect is more pronounced than in adults. Even small amounts of light leaking around a blind can be enough to trigger waking during the lighter phases of sleep that occur naturally in the early morning hours between 4am and 6am.

In the UK, this is particularly relevant from March to September when sunrise can be as early as 4:30am. Without effective blackout, early morning waking during British Summer Time is almost inevitable.

What counts as true blackout

True blackout means the room is dark enough that you cannot see your hand in front of your face with the door closed. If you can see outlines of furniture, shapes on the wall, or light around the edges of the blind, it is not dark enough.

Most standard blackout blinds — including those marketed as blackout — allow significant light leakage around the edges. This is the single most common reason families tell me they have tried blackout and it did not help.

Best blackout options

Portable blackout blinds (travel and rental homes)

Tommee Tippee Sleeptime Portable Blind. Attaches to the window with suction cups. Easy to install and remove. Blocks the window surface effectively. The best travel option and also works well as a temporary solution in rental properties. Suction cups work on most smooth glass surfaces.

Gro Anywhere Blind. Similar suction cup design to the Tommee Tippee but with a slightly different attachment mechanism. Works well on standard windows. Can struggle on textured or very cold glass.

Permanent blackout solutions

Made-to-measure cassette blackout blinds with side channels. The most effective permanent option. The cassette housing at the top prevents light leaking over the blind. Side channels — tracks that run down each side of the window frame — eliminate the light gaps at the edges that are the main weakness of standard blinds. More expensive than off-the-shelf options but dramatically more effective.

Blackout curtains with a pelmet and overlap. Heavy blackout curtains that extend well beyond the window frame on both sides and above, combined with a pelmet to cover the top, can achieve very good darkness. The key is the overlap — curtains that just meet in the middle allow light through the centre gap.

Blackout film or blackout fabric stuck directly to the glass. The most budget-friendly permanent option. Static-cling blackout film applied directly to the glass eliminates all light from the window surface. It does not look attractive from outside, but it is the most effective and cheapest approach if aesthetics are secondary.

When blackout makes the biggest difference

Early morning waking. If your baby consistently wakes between 4:30am and 5:30am, light is almost certainly a contributing factor. True blackout often adds 30 to 60 minutes to the morning wake time.

Short naps. Naps taken in a light room are more likely to end at the 30 to 45 minute mark as the baby transitions from deep to light sleep and light triggers a full waking.

Bedtime resistance in summer. Putting a baby to bed at 7pm when it is still bright outside is significantly harder without blackout. The light signals daytime to the brain.

For a complete guide to early morning waking, see our early morning wakings hub.

Common blackout mistakes

• Assuming a blind labelled blackout provides true blackout — most do not, due to edge light leakage
• Only blacking out the main window and forgetting smaller windows, door panels, or skylights
• Using blackout only at night and not for naps — daytime naps benefit from darkness just as much
• Giving up after trying one product that did not work — the issue is usually light leakage at the edges rather than the product itself

How to test your blackout

Go into your baby’s room at midday on a bright day. Close all blinds and curtains. Sit in the room for 3 minutes to let your eyes adjust. If you can see furniture outlines, the silhouette of your hand, or any light around blind edges, it is not dark enough.

The most common weak points are the top of the blind (light leaking over it), the sides (light leaking around the edges), and the bottom (light leaking under the blind if it does not sit flush against the window frame).