Il y a même un nom pour ça...

»» Delayed sleep phase syndrome - (Wikipedia) :

""…also known as delayed sleep-phase disorder or delayed sleep-phase type, is a circadian rhythm sleep disorder, a chronic disorder of the timing of sleep, peak period of alertness, the core body temperature rhythm, hormonal and other daily rhythms, compared to the general population and relative to societal requirements. People with DSPS generally fall asleep some hours after midnight and have difficulty waking up in the morning.

Often, people with the disorder report that they cannot sleep until early morning, but fall asleep at about the same time every "night". Unless they have another sleep disorder such as sleep apnea in addition to DSPS, patients can sleep well & have a normal need for sleep. Therefore, they find it very difficult to wake up in time for a typical school or work day. If, however, they are allowed to follow their own schedules, e.g. sleeping from 4 a.m. to noon, they sleep soundly, awaken spontaneously, & do not experience excessive daytime sleepiness.""

Ça ne doit pas être loin de ce que je ressens. Je me lève à sept heures péniblement et je suis ensommeillé toute la matinée, et puis graduellement de moins en moins plus le jour s'avance plus je me sens éveillé et pétillant, le soir j'ai la pêche et même si je ne me couche pas tard je n'arrive pas à dormir avant une heure avancée.

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