+1 ^^^ if after that you cant find him move out of that room to the next nearest room. However they usually don't go far so look very hard in the original room as he may be in a very tight secure space. If you still can't find him, check warm spots, tight spots etc. Then if he still isn't showing himself, put flour on the floor to show tracks of where he's been, a mouse/rat out, plastic bags for noise (make sure he cant get easily stuck in them) then turn off the lights or wait till dark and keep it quiet so you can hear him etc etc. Usually they are fairly easy to find. Also always check the enclosure as sometimes they just like to be back safe in the warmth of there home.
Best of luck!