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‘It took these participants longer to achieve the same level of alertness as opposed to the individuals who read printed books.’ How to beat morning grogginess ‘One study found that participants that used light-emitting eReaders had increased levels of morning grogginess as well as reduced melatonin release and decreased sleepiness before bedtime. ‘Blue light is especially good at disrupting the production of melatonin – a hormone that is key in helping to induce sleep.
‘A central circuit that is sensitive to light called the suprachiasmatic nucleus (SCN) controls the production of the hormones that support when we sleep and when we wake,’ says Verena. ‘Being woken at this stage of sleep is likely to leave you feeling groggy and even mentally impaired for anything like 30-60 minutes as blood is redirected from the brain to the muscles of the body.’Įxposure to blue light, that comes from electronic devices like phones, can interrupt our circadian rhythm, she adds. ‘In the stage of deep sleep, known as N3, brain waves are extremely slow making it very difficult to wake up,’ she says. ‘Whilst we sleep, our brains go through various stages of sleep where brain waves become higher in amplitude and lower in frequency,’ Verena tells .uk. It can also be caused by waking up at the wrong point in your sleep cycle or external factors like exposure to blue light before bed, she adds. Grogginess, says Dr Verena Senn, sleep expert at Emma – The Sleep Company, can often be put down to sleep inertia, part of the process of moving between sleeping and waking where your brain takes a little time to transition between the two states.