Sleep hygiene
Everyday habits that make good sleep easier: a regular bedtime, avoiding caffeine in the evening, a dark and cool room.
A little more detail
Behavioural advice on caffeine, alcohol, nicotine, exercise, sleep schedule and the bedroom environment. It is valuable for public health, but on its own it is not recommended as a treatment for chronic insomnia.
Source: Irish LA, Kline CE, Gunn HE et al. The role of sleep hygiene in promoting public health: a review of empirical evidence. Sleep Med Rev. 2015;22:23-36. doi:10.1016/j.smrv.2014.10.001