Sleep monitoring device 2, 2 positioned e.g. on a wall or ceiling, comprises a motion sensor, preferably an ultra-wideband (UWB) radar sensor, positioned around 40cm from the chest. Motion data gives user respiration, heartbeat or body & limb movement information which, along with data from an environmental sensor such as light, temperature, humidity or noise (e.g. for correlation), is transmitted preferably wirelessly to a mobile device or remote server. Determined patterns of sleep stage e.g. REM indicate quality and duration of sleep, while visual or audible alarms may be used for a waking. Also disclosed are a device 4 having LEDs controlled by a lighting programme received from a mobile device or remote server, to modulate the users circadian rhythm, and a system determining sleep patterns from motion data of the user, producing a circadian rhythm model and associated lighting programme.
