This is the 17052nd most frequent Russian word.
сплю
"I sleep" or "I am sleeping."
The verb 'сплю' here is used to describe a habitual action of sleeping.
Я сплю каждую ночь около восьми часов.
I sleep about eight hours every night.
The verb 'сплю' is used to express the action of sleeping during which dreaming occurs.
Когда я сплю, мне часто снятся интересные сны.
When I sleep, I often dream interesting dreams.
The verb 'сплю' describes a current ongoing action in the present.