The pharmacokinetics of pill-form melatonin may be responsible for the uneven-, or late-onset and morning grogginess. Others here have reported that and I experienced it as well.
I have yet to see others mentioning the following answer so ...
My doctor advised using sprayed liquid melatonin (purchased at Whole Foods). 1-2 sprays under the tongue and held there for 30 seconds, then washed throughout the mouth (a highly vascularized area) and swallowed, transports the hormone consistently so that sleep is compelled in 1 to 1.5 hours with no morning grogginess.
I have yet to see others mentioning the following answer so ...
My doctor advised using sprayed liquid melatonin (purchased at Whole Foods). 1-2 sprays under the tongue and held there for 30 seconds, then washed throughout the mouth (a highly vascularized area) and swallowed, transports the hormone consistently so that sleep is compelled in 1 to 1.5 hours with no morning grogginess.