Flying to Europe and both dc have melatonin. Dc1 normal tablets and dc2 has circadian so long release. Flight hike is 9pm. We will land about 11pm, then have suitcase pick up, taxi home and be back about 1am. When should I give it to them to not mess them up too much? They aren’t little so will not be carried and have to walk themselves, do I just wait and give to them when we land?? Normally they would have it about 630pm.....