Yes rabbits do sleep.
However rabbits mostly sleep during the day but sometimes will also sleep at night as well.
I used to have a rabbit as a kid and the rabbit would be mostly asleep during the daytime.
However the rabbit would also sleep at night when it was tired.
Rabbits are crepuscular species of animals and this means that they are at their most active around dawn and dusk.
So you'll see a rabbit more active during dawn and dusk hours but sometimes the rabbits will be awake during the day as well.