If you open a Lan world and you lay down in a bed and somebody else in spectator mode is one the Server it wont be day.
The attached Screenshoot explains the situation
Environment
Windows 7 64 bit, Java 1.8.0_25 64 bit,
MC-89270
Won't change to day if somebody is in spectator mode
Resolved
Duplicate
0
This should be fixed in the snapshots, see MC-47080.