Scott, thank you for the research and information. I started working 3rd shift 9 months ago and have yet to find an effective sleep routine. I suspect melatonin over dosage is a big cause and look forward to experimenting with a lower dose. I struggle with onset (takes me about an hour) and also startle awake 3-4 hours later. I am considering a 300 mcg time released tablet to hopefully re-dose myself throughout the night.