People usually feel tired at certain times, like in the mid-afternoon, especially after lunch. There's this natural slump that happens. Also, if someone's been inactive for a long time, like sitting at a desk all day, they might feel really tired too.

Nowadays, many people don't sleep well or have bad sleeping habits, making them more tired. Some can't sleep at all, which is really hard. Others watch TV before bed, which keeps their brain active and stops them from sleeping. Even worse, some people take their phones to bed and spend the night on social media. As a result, they get very little sleep and wake up exhausted in the morning.

People often feel tired not just physically, but mentally too. This can happen when they are bored or not really into what they're doing. Also, if they've been working too much or focusing really hard on something, mental exhaustion kicks in, making them feel tired.