My 3 year old loves sleeping in a hammock. He sleeps in the hammock with me with absolutely no problems. I would have no problems with him sleeping in his own if I hung his from the same trees as mine and had him beside me. I have also left him in the hammock by himself when he sacked out early and I drank coffee, he stayed in by himself for around 3 hours with no problems. You just have to keep an eye on them and be careful.