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Right now my turtles is sleeping with her head under water while the other is sleepin on the dock. i dont know what to do im afraid it will drown. But when i move it to the dock she jumps back in to the water need help urgently sorry

This is very normal for an RES. Some sleep totally immersed in water and resting on the bottom of their tank, some sleep with their head/nose out of water. Some sleep on their dock.. Your turtle isn't going to drown if it sleeps underwater

Turtles can hold their breath up to three hours under water while sleeping and about 15 minutes while awake. Don't worry about him sleeping under water, it's what he prefers. Just like each person has their favorite sleeping position, stomach, side, back etc.