You have tried rocking, feeding and shushing, but your baby still wakes again and again. Sometimes the room itself is part of the problem: too warm, too bright or too noisy. Setting up the best sleep environment for babies is one of the easiest changes you can make, and it also makes sleep safer. Here is what matters most.
Quick answer: the best sleep environment for babies
- Temperature: a room of about 16 to 20°C (61 to 68°F).
- Light: dark for night sleep and naps, with a dim, warm night light for feeds.
- Sound: quiet, or steady white noise at a low volume.
- Cot: a firm, flat mattress with a fitted sheet and nothing else inside.
Room temperature and clothing
Overheating is linked to a higher risk of SIDS. Keep the room comfortably cool and dress your baby in one more light layer than you would wear to sleep, or use a sleep bag with the right tog for the season. Check your baby’s chest or the back of the neck: it should feel warm, not sweaty. Hands and feet often feel cool, which is normal. No hats indoors.
Light
- Use blackout curtains or blinds, especially in summer and for daytime naps after the newborn weeks.
- Choose a dim, warm-coloured night light for night feeds and changes.
- Avoid screens and bright overhead lights at bedtime.
- Get daylight during the day to help your baby’s body clock. See day and night confusion.
White noise and sound
Steady white noise can mask sudden sounds and help some babies settle. Keep it quiet, roughly the level of a running shower heard from the next room, and place the device at least 2 metres from the cot. It is not required: many babies sleep well in a normal quiet room.
What goes in the cot, and what stays out
- In: a firm, flat, waterproof mattress that fits snugly, and a fitted sheet.
- Out: pillows, duvets, cot bumpers, positioners, wedges and soft toys.
- Use a well-fitting sleep bag or a thin blanket tucked in no higher than the shoulders, with your baby’s feet at the foot of the cot.
- Keep the cot away from windows, blind cords, heaters and shelves.
Room-share, ideally for at least the first 6 months. See safe sleep practices and when to stop swaddling.
Air quality
- Keep the home smoke-free.
- Air the room daily.
- A cool-mist humidifier can help in very dry rooms; clean it daily.
When to talk to your doctor
- your baby feels hot, sweaty or has a fever at night
- noisy breathing, snoring or pauses in breathing
- sleep stays very disturbed despite a good routine and environment
Frequently asked questions
Is a fan safe in a baby’s room?
A fan can help keep the room cool in hot weather. Do not point it directly at your baby.
Should naps be in a dark room?
Young newborns can nap in normal daylight. From around 2 to 3 months, a darker room can help longer naps.
What tog sleep bag should I use?
Follow the maker’s guide: roughly 2.5 tog for 16 to 20°C, and lower tog in warmer rooms.
Sources
- American Academy of Pediatrics: Safe sleep recommendations (2022)
- The Lullaby Trust: Room temperature and safer sleep
- NHS: Helping your baby to sleep
This guide is general information, not medical advice. If you are worried about your baby’s sleep or breathing, talk to your doctor.