What happens when a person sleeps with AC on all night?

Long-term AC use can reduce humidity, drying out skin and causing discomfort, Financial Express reported. Poor ventilation keeps air stagnant, encouraging mould growth and worsening respiratory issues. Excessive cooling may disturb sleep, leaving one groggy. Direct cold air can also affect the ears, causing pain. Experts advise maintaining 20–25°C and limiting AC use during sleep to 1–2 hours.