Dolphins: Dolphins have the ability to sleep with only half of their brain at a time, which allows them to stay alert. Newborn dolphins don't sleep for a month after birth.
Giraffes: Giraffes can stay awake for a full day and only sleep for a few minutes to two hours. Their height and vulnerability to predators demand constant alertness.
African elephants: These creatures can stay awake for days during migration and other important activities.
Tilapia: Tilapia don't sleep because they don't have a pineal gland, which produces melatonin.
Alpine swifts: Alpine swifts are birds that spend most of their lives flying and only sleep for short periods when flying at high altitudes. They can be up in the sky for months without landing.
Bullfrogs: Bullfrogs can go without sleep for long periods of time. They enter a state of dormancy, which is a period of inactivity and lowered metabolism.
This information is not DNA’s opinion but obtained from media reports.