Do you get out of bed after eight hours of sleep and feel like you have the weight of the world on your shoulders? Morning tiredness represents a very widespread and often underestimated problem. Among the causes, there is one that you have probably never thought about: the mistake you make with evening hydration.
The link between hydration and sleep quality
During the night the body continues to lose fluids through breathing and perspiration. When we wake up we naturally find ourselves in a state of mild dehydration, which contributes to the feeling of dizziness and fatigue. The brain is made up of 75% water and even a slight lack of liquids compromises cognitive functions, causing that mental fog that characterizes the early hours of the morning.
A study published in the journal Sleep showed that sleeping for just six hours or less is significantly more likely to lead to poor hydration than sleeping for at least eight hours. The research involved US and Chinese adults, highlighting how sleep duration is associated with urinary markers of dehydration.
As if that wasn’t enough, further research has revealed how fluid intake has a positive correlation with the duration of the REM phase of sleep, with the total duration of sleep and is a decisive parameter for the efficiency of rest, an aspect which suggests how the quantity of water consumed can influence the quality of sleep itself.
The mistake you make in the evening
Many people completely avoid drinking in the evening hours for fear of having to get up during the night. A choice which, although apparently logical, produces the opposite effect: the body arrives at the end of the day already dehydrated and spends the night hours in a state of water deficiency. In the morning, accumulated dehydration manifests itself with tiredness, difficulty concentrating and bad mood.
Research has shown that dehydration produces significant effects on mood, with particular impact on parameters related to the sleep-wake cycle, causing increased drowsiness, fatigue and confusion.
Another very common mistake is drinking excessive quantities of water immediately before going to bed. This habit stimulates urine production, causing multiple nocturnal awakenings that fragment sleep and prevent natural rest cycles from being completed.
The correct strategy for evening hydration
The key, as always, lies in balance. Experts recommend distributing fluid intake throughout the day, avoiding both evening deprivation and concentrated excess. During the day you should consume at least two liters of water, distributed in small, constant sips.
As for the evening, the ideal approach is to drink your last glass of water one to two hours before going to bed. This time window allows the body to absorb liquids and the kidneys to process them, so as to reduce the need to get up during the night. The recommended quantity is approximately 250 ml, equivalent to a standard glass.
The temperature of the water is also an aspect to consider, because water at room temperature is absorbed more quickly, while hot water offers additional benefits: it promotes blood circulation, relaxes the muscles of the digestive system and prepares the body for the relaxation necessary for a good rest. You can add a slice of lemon to make it more palatable, just remember to avoid sugar and caffeine.
Recognize the signs of nighttime dehydration
If you feel dry mouth, headache, confusion or irritability in the morning, your body probably suffered from dehydration during the night. Other indicators may include dark-colored urine upon waking and less elastic skin, signs that suggest the need to increase daytime hydration and maintain a moderate amount of fluids even in the evening.
During the summer months or in particularly heated environments, the loss of liquids increases through night sweating: in these cases, drinking before sleeping becomes even more important to prevent dehydration and ensure quality rest.
Hydration and morning brain function
The brain is heavily dependent on hydration to function properly, as water deficiency reduces cell volume and impairs neural activity. Upon awakening, when the brain must “switch on” after hours of rest, the availability of liquids therefore becomes very important to quickly re-establish cognitive functions.
Drinking a glass of water as soon as you get up is the first step to reactivating your metabolism and providing immediate energy to your brain. This practice, combined with correct evening hydration, will create a virtuous circle that will improve the quality of awakening.
