Sleeping before midnight is more important than at other times, a lie-in can make up for a sleepless night, a small glass of alcohol can help you fall asleep quicker… But is all this really true?Faced with the many preconceptions circulating on the subject, several scientists from the School of Medicine at New York University, United States, conducted a study recently published in the Sleep Health Journal. Rebecca Robbins, researcher and lead author of the work, consulted, with her colleagues, more than 8,000 websites to compile the facts we thought were true about sleep and then presented their findings to a committee of experts on the subject. This allowed them to identify what was actually incorrect and what could even be dangerous for our health. Here are the details.1- 5 hours of sleep per night is enough for adultsFALSE. ‘5 hours or even less’ is the surprising answer given by internet users to answer the following question: ‘If you want to be able to function at your best throughout the day, without feeling sick, and being strong mentally and leading the life you want, how many hours of sleep do you need?’For Professor Jean-Louis Girardin, who was part of the study, this is ‘the most problematic assumption’ he found. Indeed, an adult must sleep between 7 and 10 hours a night depending on their age. Last March, the NHS warned that most adults now sleep less than 7 hours a night and unsurprisingly, this has led to subsequent health-related consequences. ‘Sleep plays a crucial role in metabolic and thermodynamic balance, tissue restoration, wound repair, growth, memory, sorting ideas and regulating emotions,’ the report concluded.2- Snoring is annoying (especially for your companion) but it is harmless FALSE. Obviously, we are talking here about recurrent snoring and not the kind that punctually accompanies those nights that we have a cold. This manifestation of sleep apnea is not to be taken lightly. According to the National Institute of Heart, Lung and Blood (USA), this sleep disorder increases the risk of heart attacks, atrial fibrillation, asthma, high blood pressure, glaucoma, cancer, diabetes, kidney problems, cognitive dysfunction and behaviour disorders. This is why it is essential to consult a professional if you are a snorer, not just for your health, but also so your partner can get a good night's sleep!3- It doesn’t matter when you sleep, as long as you sleepFALSE. Working nights, alternating or staggered hours... This all has an impact on your health, and all this comes from our biological clock that acts as conductor of our body. That is why it must be respected. The synchronisation of this internal clock is mainly set by the natural light\/dark cycle.When your body clock no longer matches the outside world, you feel ‘out of control,’ disoriented, you go through the day in a fog and fatigue is felt when you should be functional. The same sensations as when you experience jet lag after a trip.People then suffer from a lack of sleep, are overweight or even obese, and suffer from mood and attention disorders. Studies have shown that in the long term, this can increase the risk of cardiovascular disease, ulcers, depression and even some cancers.