Why can't I sleep even when I'm tired?

This often happens when the body is tired but the mind is still alert from stress, screens or worry. Keep a regular wake-up time, avoid caffeine after afternoon, dim lights and screens an hour before bed, and get out of bed if you can't sleep after 20 minutes. Persistent insomnia can be linked to anxiety, depression or medical issues. CBT for insomnia (CBT-I) is a proven, medicine-free treatment a psychologist can guide you through.