According to researchers from Stockholm University, sleep actually affects how old you feel.
This means that sleeping well can leave you feeling young and refreshed.
But, on the flip side, a few bad nights of sleep will age you.
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They were then asked to sleep nine hours for two consecutive evenings.
Each time, they were asked how old they felt.
On average, the participants felt 4.4 years older when their sleep was restricted.
Interestingly, how the participants viewed their age has a lot to do with their level of sleepiness.
When extremely alert, they felt four years younger.
Conversely, when extremely tired, they felt much oldersix years, to be exact.
Safeguarding our sleep is crucial for maintaining a youthful feeling.