For example, the most common endocrine disorder associated with sleepiness is hypothyroidism, which can lead to drowsiness. Hypopituitarism can also indirectly cause hypothyroidism, which can also lead to drowsiness. Hypoadrenocorticism can also appear drowsy, and some other systemic diseases, such as anemia, respiratory diseases, heart disease can appear old sleepy, and some people are overweight is also always sleepy. Finally, it is a matter of habit, some people have the habit of sleeping, nothing to want to sleep, in fact, is a bad habit that needs to be corrected.