local speaker = peripheral.find("speaker")


while true do
    term.clear() 
    term.setCursorPos(1,1)
    time = os.time()
    if (time > 18.40) then
        speaker.playSound("block.bell.use")
        print("il est l'heure de dormir !")
        sleep(20)
    end
    print("il est "..time.." heure ")
    sleep(2)
end