Pajamas (US) or pyjamas (commonwealth) (/pəˈdʒɑːməz, pɪ-, -ˈdʒæ-/), sometimes shortened to PJs, jammies, or Jim-jams, are several related types of clothing originating from the Indian subcontinent. In the Western world, pajamas are soft, warm, and traditionally loose garments derived from the Indian daywear pajamas. They are worn for sleeping, working from home, and lounging.

Night or nighttime (also spelled night-time or night time) is the period of ambient darkness from sunset to sunrise during each 24-hour day, when the Sun is below the horizon. The exact time when night begins and ends (equally true with evening) depends on the location and varies throughout the year. When night is considered as a period that follows evening, it is usually considered to start around 8 pm and to last to about 4 am.