M.G.
I use melatonin nightly for my 3 year old son with autism. It helps him to fall asleep which is all it is intended to do. It will NOT make them sleep longer or more soundly. I realize our situation is a bit different but my 6 did ask to take it out of curiosity and yes I let her however it did not enable her to fall asleep any quicker. Talk to your doc and just as an FYI my 3 year old has been on melatonin since before he was 2. If you plan on giving it I would recommend .5mg to start with and get the chewable version, GNC carries a cherry flavored brand in 1mg tablets.