<|im_start|>user
Why do we often feel more tired after a night of poor sleep?<|im_end|>
<|im_start|>assistant
When we experience a night of poor sleep, our bodies undergo various physiological and neurological changes that contribute to feelings of fatigue. Sleep deprivation affects the brain's ability to function optimally, leading to impaired cognitive processes such as attention, memory, and decision-making. Additionally, the body produces higher levels of stress hormones like cortisol, which can further exacerbate feelings of tiredness. The lack of restorative sleep also disrupts the balance of neurotransmitters that regulate mood and energy levels, creating a compounded effect that makes us feel excessively tired the next day.<|im_end|>

<|im_start|>user
Why do we often feel more tired after a night of poor sleep?<|im_end|>
<|im_start|>assistant
Poor sleep makes us feel tired because our bodies don't get enough rest. When we don’t sleep well, it can lead to a feeling of exhaustion, and we might have a headache or feel groggy. It's important to get a good night's sleep to avoid feeling this way.<|im_end|>

Why do we often feel more tired after a night of poor sleep?