How to fix my Script that change music between day and night??

EDIT: I thought of a new solution. Instead of using a loop, let's just use the signal that detects whenever the ClockTime is changed.

local sound = workspace.Sound
local sleepsound = workspace.SleepSound
local Lighting = game:GetService("Lighting")

local startOfDay = 6
local startOfNight = 18

script:SetAttribute("Daytime", true) -- creates the attribute
script:GetAttributeChangedSignal("Daytime"):Connect(function()
	local attribute = script:GetAttribute("Daytime")
	if attribute == true then -- if it's true (day)
		sleepsound:Stop()
		sound:Play()
	else -- if it's false (night)
		sound:Stop()
		sleepsound:Play()
	end
end)

Lighting:GetPropertyChangedSignal("ClockTime"):Connect(function()
	local clockTime = Lighting.ClockTime
	
	if (clockTime >= startOfDay) and (clockTime < startOfNight) then -- if it's daytime
		script:SetAttribute("Daytime", true)
	elseif (clockTime >= startOfNight) or (clockTime < startOfDay) then -- if it's nighttime
		script:SetAttribute("Daytime", false)
	end
end)

OLD: I recommend use BoolValues or Attributes. Attributes are basically custom "properties" you can make in Instances. When it's day, you make the Attribute true, and false when it's night. Then, when the attribute changes, connect Instance:GetAttributeChangedSignal() signal to a function where it plays a music whether it's day or night.

local sound = game.Workspace:WaitForChild("Sound")
local sleepsound = game.Workspace:WaitForChild("SleepSound")
local timer = game:GetService("Lighting")

script:SetAttribute("Daytime", true) -- creates the attribute
script:GetAttributeChangedSignal("Daytime"):Connect(function()
	local attribute = script:GetAttribute("Daytime")
	if attribute == true then -- if it's true (day)
		sleepsound:Stop()
		sound:Play()
	else -- if it's false (night)
		sound:Stop()
		sleepsound:Play()
	end
end)

while task.wait(1) do
	if timer.ClockTime >=19 and timer.ClockTime <= 8 then
		script:SetAttribute("Daytime", false) -- sets the attribute to night
	elseif timer.ClockTime <=19 and timer.ClockTime >= 8 then
		script:SetAttribute("Daytime", true) -- sets the attribute to day
	end
end