Hi,

I have two 4 year olds as well and they don't always nap but must sit for quiet time. They sit in the family room with the curtains drawn and blankets on. I put on a movie for them each day or a video. I usually let them pick it.
The odd time they may get restless so I sit with them or let them do a puzzle or something quiet!

Mine sit for 1 hour to 1 1/2 hours each day!