Having enough quality sleep is vital to your emotional and physical wellbeing. We sleep so we can be active, focused and feel good during the day. Not being able to get to sleep can be really distressing. If you haven't been able to rest properly, your body and mind can start doing strange things. Poor sleep can be a vicious cycle – not enough sleep may cause the brain to become more active and an over-stimulated brain is less able to fall asleep.