What many have learned to do, often just by accident (but it's a method gaining popularity and traction) is to try to fall asleep 'naturally'. Many/most of us can at least do that much. If we awaken, whether due to mental activity or bladder activity, THAT is when they take their soporific. Since we all are meant to have close to 7 hours, but awaken at roughly 3-4 hours, we presumably have another 3 hours left due to us, and our body clocks 'should' know this. By slipping a gummy of melatonin, about 2.5 mg into our gullet, and trying to drift off, we might just get that 'nuther 3 hours. It seems to work for a lot of people.
Of course, if you have some appointments or meetings, or trades coming to the house, and you would normally have to be up, say, at 0700 hrs, then don't do that...not on that occasion. Maybe the following night if your next day is looking clear.