常夜灯の選び方：赤ちゃんの睡眠のために

Why avoid blue or white light at night?

Bright and blue-rich light suppresses melatonin, which can make it harder to fall back asleep. A study in preschool children found even dim evening light had a strong effect. Warm, very dim light is the gentler choice.

How bright should a baby night-light be?

Very dim: the tool suggests from **3–8 lumens** (small room, under 6 months) up to **15–40 lumens** (large room, 12–36 months). Enough to see what you’re doing, but dim enough not to wake the baby fully.

Where is the best place to put a night-light?

Low on the wall or floor, facing away from the crib. Avoid placing it directly beside or above your baby’s sleep area.

Do newborns need a night-light?

Not always. Some families prefer total darkness, but a dim amber light can help with safe night feeds and changes.

Can a night-light help with baby sleep training?

A night-light won't train sleep on its own. Keeping night-time light dim and consistent, and daytime bright, helps mark the difference between day and night.

Is red light better than amber for babies?

Both are fine — red and amber are low on the blue spectrum. What matters most is keeping brightness **very low**.

Should parents use the same night-light rules for themselves?

Yes — using dim, warm light at night supports melatonin for everyone and makes it easier for parents to fall back asleep after wake-ups.