breastfeeding at night

My son is almost 5 months and exclusively breastfeed. He goes to sleep at 8pm, but wake up to feed at 11pm, 2am, 4 or 5 am, 7 or 8 am. Then wake up, stays usually around 1.5hr, and nap for 30 min -1 hr - and if I stay near him he sleeps longer. Then feed at around 1 pm and 3 or 4 pm. From 4 pm till 11 pm he doesn't want to feed. I don't know if he is full and doesn't want to feed or what. Usually he feeds while asleep, bc of my really fast let down which doesn't regulate yet. Now he started to feed sometimes while awake but is veru very very distracted. One minute takes the breast, pull it off. For 10 minutes, he can come on and off the breast for more than 30x. For 7 hours he doesn't want to feed at all. Another mom with this problem?! What do you think? Is it normal to go 7 - 8 hours a day without feeding?