I always wondered how NPC's could sleep uncovered without freezing. This mod aims to fix that. It adds an equippable blanket to the player and NPC's, which they will equip when they go to sleep. I also made sure that the script skips over the following events: If the NPC is a vampire, if it's Henantier having nightmares and if it's Jeelius while he's imprisoned by Dagon's shrine.
NEW: Big thanks to claustromaniac for providing me with an improved version of this mod, which also includes a configurable INI file. NPC's will now equip a blanket depending on the bed they're sleeping in. The auto-equip feature for the player is turned off by default in the INI, but can be set to 2 or 3 if you want to use it with See You Sleep. If you choose to leave this feature disabled, you still have the possibility to buy blankets from the Three Brothers' Goods in the IC market district.

This mod requires OBSE.

If you update from an older version, make sure you do a clean save.

The blanket is a mesh I grabbed from EFG_add_pose and modified in Blender and NifSkope, so I don't take credit for the original mesh.

Recommended mods:
See You Sleep DLL, Self explanatory.
NoMaaM Breathing Idles, it brings more life into most vanilla idle animations (including sleeping) by adding a breathing movement.