Tip for rookies: If you're going to spend the night at Rostok, always remember to bring your own sleeping bag, lest you be observed by the Mangun while you sleep : r/stalker
Sleeping bag CS mod for S.T.A.L.K.E.R.: Clear Sky - Mod DB
Upgraded Sleeping Bag addon - S.T.A.L.K.E.R. Anomaly mod for S.T.A.L.K.E.R.: Call of Pripyat - Mod DB