Furthermore, bacterial circadian rhythms may affect the bugs' resistance ... Theoretically, this "complex interplay" might be disturbed by diseases that affect the gut, he told Live Science ...

But the issue is not indicative of willpower or lack thereof, but a sign that someone may be dealing with an issue such as bad sleep hygiene, disturbed ... someone’s circadian rhythm is shifted ...

One of the most significant and well-known circadian rhythms is the sleep-wake cycle ... it can create a disturbance in the sleep-promoting hormone melatonin, meaning it can't properly balance ...