To tuck in the blankets at night in English, you can say "tuck in the blankets" or "tuck in the sheets." You can also say "tuck in the bed," which means to make the bed neatly by pulling the blankets and sheets up over the mattress and making sure they are smooth and tidy. You can also use the phrase "tuck oneself in," which means to get into bed and make sure the blankets are wrapped around you snugly.
