Sleep hygiene is the collection of daily habits and bedroom conditions that support reliable sleep: consistent wake times, morning light exposure, limiting caffeine after midday, a dark cool room, and winding down away from screens before bed.
Good sleep hygiene is the foundation of every sleep treatment but is rarely sufficient alone for established insomnia, which responds best to structured behavioural therapy. Persistent poor sleep despite good habits warrants a medical review, since conditions like sleep apnoea, pain and anxiety commonly hide underneath.