Question 1

How do I know if this is a sleep regression?

Accepted Answer

Sudden night waking or short naps around known developmental windows (about 4, 8–10, 12, and 18 months), with an otherwise healthy baby, often points to a regression or schedule mismatch.

Question 2

How long do sleep regressions last?

Accepted Answer

Often 2–6 weeks when wake windows and bedtime cues stay consistent. The 4-month shift is a lasting change in sleep cycles, but symptoms settle with the right timing.

Question 3

Should I sleep train during a regression?

Accepted Answer

Fix daytime timing first. Many families see improvement without changing settling method. If you do change approach, hold it for several nights before judging.

Sleep regression quiz