How do I keep my Seat Animation looping using LUA?

So I'll be honest, this isn't my script. I followed a tutorial on YouTube to make it, it works well however - I can't get the animation to loop. The Animation is self explanatory, it's sleeping, my issue is getting the animation to loop.

Also, if possible, can anyone tell me how I can remove R15 out of the script since it's essentially useless to me?

local seat = script.Parent
local sleepingR15 = seat.SleepingR15
local sleepingR6 = seat.SleepingR6
local sleepAnim



seat.Changed:Connect(function(property) 
	
	if property ~= "Occupant" then return end 
	
	local occupant = seat.Occupant
	
	if occupant then 
		local character = occupant.Parent
		local humanoid = character.Humanoid
		local player = game.Players:GetPlayerFromCharacter(character)
		if player and humanoid.RigType == Enum.HumanoidRigType.R15 then 
			sleepAnim = humanoid:LoadAnimation(sleepingR15)
			sleepAnim:Play()
		elseif player then 
			sleepAnim = humanoid:LoadAnimation(sleepingR6)
			sleepAnim:Play()
			
		end
	elseif sleepAnim then 
		sleepAnim:Stop() 
	end
end)