Help to make your iPhone stay connected to your Wifi

Does anybody know a good way to make sure your iPhone stays connected to your wifi? Every time I'm in my room in bed, my phone constantly drops connection with the Wifi despite me not actually being very far from my router. Anywhere else around the house or even my room. my wireless works fine, so I believe my bed just happens to be a dead zone of some sort. I'm just wondering if there's a way that once connected, you can do something to make sure it stays connected. Any help would be greatly appreciated!

P.S. I have an iPhone 5s that's fully updated in iOS for as much as a 5s can be