Why does calling one function automatically stop any further to be called?

local lighting = game.Workspace.Model
local light = lighting.LightPart

local timeOutput = game.Lighting:GetMinutesAfterMidnight()


local nightStandard = 6

local dayStandard = 18


local num = 2

local function DayNightCycle()
    while wait(.2) do
        num = num + 1
        game.Lighting:SetMinutesAfterMidnight(num *60)
        print(game.Lighting.TimeOfDay)
    end
end

local function bindToTime()
    print("binded")
end





while wait(1) do bindToTime() end

DayNightCycle()

For some explanation, I'd like to add that switch the bindToTime function being called and DayNightCycle does matter, because if I add DayNightCycle() first, bindToTime() won't work. How can I prevent from one function being called automatically stopping the entire script?