I've read recently the spirit section of Street Grimoire, and I can not recall anything about that. Also I can not really recall a piece of fluff or a novel that would implie so.
Spirit are not creature of the flesh, so i would not except them to require sleep or rest, but one could argue that they need "rest time in Astral place" for instance. So if a player ask a bound spirit to patrol 7 days a week his safehouse, as a GM you could ask for 2 bound spirits rotating for instance...
Also, the nature of the spirit could play a part here - like a mankind spirit may actually need to sleep (as it is an anthropomorphic reprsentation of mankind who does sleep a lot). Or a fire spirt my need to fuel itself , so maybe it could stay on forever, but your player needs to have a bonfire nearby...
That is just idea, spirits are still (intentionly I think) rather vague in Shadowrun.