Norns doesn't awaken from a long sleep

[xmacex]

If norns is left alone for a long time, say overnight, the screen won't awaken from sleep. I am not sure whether it is doing something, e.g. synthesis or pushing MIDI etc. I'll try to reproduce so that I can confirm whether it's just the screen.

sshing in and sudo service norns-maiden restart brings it back up, but of course everything which was running is lost.

Norns and ambient musician after a concert
Henry Meynell Rheam
Aquarell (1899)