Why not let him sleep on the floor in your room when he wakes up. My son is almost 6 and still wakes up and comes in our room. We have a small fold out wiggles couch that I put next to my side of the bed and when he wakes he comes in lays down and goes right back to sleep or if my husband is gone to work already I let him in the bed(otherwise there isn't enough room). They won't be little forever make him feel secure. It sounds like you are very busy he probally misses you and if sleeping near you makes him feel close let him. All three of my kids did this they will out grow it. If that isn't an option go lay with him in his bed until he goes back to sleep. You could try getting him a special sleep toy but he probally just wants his mommy. Treasure those nights instead of regretting them. Good luck.