Because 5am everyone is hungry as it is abt 10 hours since supper. But as long as ur not fainting from hunger, you should wait another few hrs until breakfast.
We don’t need to feed our bodies as soon as the last meal was digested.
As long as your getting 3 nutritious meals a day, and yes of course you can snack on something too. But after supper its best not to eat until you wake up the next morning.