If you wear an automatic watch during the day and take it off to go to bed, you do not need to wind the watch additionally by hand.

When an automatic watch is fully wound it has sufficient power reserve in the mainspring for at least 38 hours. The power reserve depends on the type of watch movement. In the automatic movements used in the current IWC collection, it ranges 38 hours. If the watch is not worn at night, the movements to which it is subject next day are normally enough to wind it fully again.

However, please note that a certain minimum amount of movement is necessary during the day. If this is not possible, you should wind the crown 30 to 40 times a day by hand, as with a hand-wound watch. One more thing: ideally you should not wear your watch in bed. In the long term, fine particles of dust and skin can damage the oils and lubricants.