I mean like completely alone? Like in another part of the house?
Our house is pretty well babyproofed (like anything that would require an ER visit - stairs, heavy objects, furniture anchored, outlets, small choking items.) DS sleeps on a mattress on our floor and when he wakes up - I can hear him on the monitor - he'll often play happily by himself for maybe 20 minutes or so. He'll plod around the room or go into other rooms and I'll finish working or cleaning or whatnot.
Other times, for example, I'll be putting away laundry in one room and he'll be playing in another room. He'll crawl in and say hello now and then, but he'll often be happy to be doing whatever baby thing is fascinating him at the moment (chewing on EVERYTHING, throwing clothing on the floor, etc.)
Sometimes I feel a little guilty, like I should be playing with him more. I think this is the part of my Crazy Mommy Brain that says I should be teaching him French verbs or encouraging him to develop his pincher grasp or something. Of course, it's not like I ignore him and we spend a lot of other time playing and if he's ever crying or upset I get him immediately.
I dunno ... anyone else?