text: However, if you are not able to fully switch off at night, you may sleep, you may dream, but you may not ever reach this magic state of re-setting to enable you to start the next day refreshed and up to speed. Recent research has also shown that the processing of information and storing it as a long-term memory can only happen at a deep level of sleep.
  In order to reach that essential state of sleep, the body needs to be able to produce enough melotonin, our sleep hormone. If you are stressed, anxious, busy-headed your body will struggle to produce sufficient melotonin and instead your brain will remain at least partially active due to an excess of the stress hormone cortisol.