In any gamemode, when you go to sleep, if the FOV is over 100 [101 to Quake pro], you will se your head's inside instead of the regular view.
It appears as resolved in following tickets:
https://bugs.mojang.com/browse/MC-39647
https://bugs.mojang.com/browse/MC-19
https://bugs.mojang.com/browse/MC-10651
Environment
Windows 7 Ultimate x64
java version "1.7.0_65"
Java(TM) SE Runtime Environment (build 1.7.0_65-b20)
Java HotSpot(TM) 64-Bit Server VM (build 24.65-b04, mixed mode)
Fixed in 14w08a (1.8 Snapshot). MC-19