Black sheets are hotter than white sheets. When you have a choice between sleeping on sheets that are black or white, it might seem like the latter would be warmer. But one thing to keep in mind about these types of bedding fabrics is their ability to absorb heat from sunlight and store it for later use when needed. So every night, your chosen set will probably still feel incrementally warmer than any other color because they’re absorbing more warmth during daytime hours which washes away slowly over the course of minutes as darkness falls again.