It's just important to remember that melatonin, like most all dietary supplements sold in the U.S. is severly under studied. Melatonin is allowed to be sold because it exists in nature, not because it has been proven safe. This is essentially true of anything sold as a dietary supplement.
Having said that, it doesn't necessarily make it dangerous. But, like myself and others have said in this post, please do take your dosage into consideration, as well as whether you're using it on a daily basis, as there are other things that could be preventing you from falling asleep/staying asleep that may be better addressed by a doctor, such as sleep apnea, as you mentioned.
Having said that, it doesn't necessarily make it dangerous. But, like myself and others have said in this post, please do take your dosage into consideration, as well as whether you're using it on a daily basis, as there are other things that could be preventing you from falling asleep/staying asleep that may be better addressed by a doctor, such as sleep apnea, as you mentioned.