So how often you should wash your pyjamas? Harpa recommends washing pyjamas after three to four nights of wearing them - but if you bathe or shower before bedtime, you can extend this period of wearing without washing to 5-7 nights, maximum.
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Natural body oils, perspiration, dead skin cells, bacteria, and body care products (like body lotion) can all build up in pajamas. If you continue to wear them without laundering, it can cause skin issues or irritation–and start to smell funky.
If you tend to sweat heavily in your sleep, moisture-wicking fabric is an ideal choice. It draws moisture away from the skin while promoting airflow, leaving you feeling cool, dry and comfortable. Cotton. Like moisture-wicking fabric, cotton is ultra-breathable and won't trap body heat against your skin.