Irregular washing of sheets.
Humans sleep for roughly 1/3 of their life. That’s 1/3 of their time in bed, tossing and turning under the covers, leaving skin cells, bacteria, sweat behind them. Without properly washing sheets on a regular basis all that grime from daily life is left behind as you slumber, and days, weeks, months of bodily excretion builds up. This bacterium is unsurprisingly awful for your skin and personal hygiene, so make sure you have a designated washing day and have the joy of fresh linen on a weekly basis!