Well Rested (perk)

Well Rested is a temporary perk in Fallout 4. It lasts 8 in-game hours, and is obtained by sleeping in any bed in a settlement under the player character's control, any rented bed, or beds in The Prydwen's quarters, at the Railroad HQ, at Ticonderoga, in the Vault 81 room, and at the Nucleus.

Requirements
Rented rooms always work and beds built by the Sole Survivor in settlements work, if no settler has been assigned. Assigning a settler to a bed will prevent the Sole Survivor from using it, as it is now owned.

In Survival mode, the player character must sleep for at least 7 hours to obtain the perk, meaning sleeping bags and mattresses cannot be used, as they only permit 3 and 5 hours of sleep respectively. However, in this mode, any bed may be used to obtain this perk, so long as the bed is not considered owned by someone else and the player character is not currently trespassing or incurring radiation damage.

Effects

 * +10% XP for a limited time (8 in-game hours).
 * In Survival mode, the effect also grants +2 to Endurance and Agility.

Bugs
Sometimes both the Lover's Embrace and the Well Rested bonus are given, adding up to a total of +25% experience while they last. Once the 8 hours are over, both perks expire with no known side effects.