Call to Prayer

Call to prayer woke me this morning some time around 4:36 a.m. I didn't mind it as it's nice to hear and usually I had no problem falling asleep again. Obviously there are plenty of mosques around so as I am listening, I could identify about 4 to 6 voices doing the call. Are people really up at that time too and going to the mosque? Maybe you have to do that because of the heat here. I do know that everything says they is an afternoon "siesta" period when all the shops close then open again later in the afternoon. I'll find that out today. I was drifting back to sleep when another call to prayer rang out. I thought at first maybe I had fallen asleep and it was a later time but no, checked the clock and it was maybe 5 minutes after all the others had stopped. How odd to me. I can get that the mosques don't start on the dot together, that's just logical human starting times. But why was one a full 5- 10 minutes later? Another human error? They didn't get to the mosque on time?