The PlayerSleepInBed Event is fired whenever a player sleeps. This event can control whether the player is able to sleep by setting result.

You will need to cast the event in the function header as this class:
crafttweaker.event.PlayerSleepInBedEvent
You can, of course, also import the class before and use that name then.

PlayerSleepInBed Events implement the following interfaces and are able to call all of their methods/getters/setters as well:

• IPlayerEvent
• IEventPositionable

The following information can be retrieved from the event:

ZenGetter	ZenSetter	Type
ZenGetter result	ZenSetter result	Type string

The following information can be retrieved from the event:

ZenGetter	ZenSetter	Type
ZenGetter player	ZenSetter ​	Type IPlayer
ZenGetter position	ZenSetter ​	Type IBlockPos
ZenGetter x	ZenSetter ​	Type int
ZenGetter y	ZenSetter ​	Type int
ZenGetter z	ZenSetter ​	Type int

The following information can be retrieved/set during the event:

ZenGetter	ZenSetter	Type
ZenGetter entityLivingBase	ZenSetter ​	Type IEntityLivingBase

result can return or set the strings: NOT_POSSIBLE_HERE, NOT_POSSIBLE_NOW, NOT_SAFE, OK or OTHER_PROBLEM