Actually you are supposed to AVOID extra melatonin because out has been proven to cause problems with the development with a fetus's pituitary gland.
No it is fine it is actually good it contains NO caffine which is good and melatonin which is a naturally created hormone to promote normal sleep, Enjoy
I don't think so I think a lot of caffiene would be the only thing you would need to worry about as far as drinking tea but sleepy time tea doesn't have any so you should be good