I am kind of new on here so I can't answer your question, but here is what I do, About bedtime I take my little one out to play, he has about 15-25 mintues of play time before he climbs on my hand to go to sleep. I just figure if he sleeps all night without heat on him and my house is never under 70 degrees, he can handle a lot of time out playing. Maybe I am wrong and I am sure someone else can tell you more, but thats what I have been doing. I just make sure I wait til about 2 hours after he eats last to get him out to play. Hope this helps a little.