Sleep 1.0

function pie()
local x = 20
local y = 10
term.setCursorPos(x, y)
term.setTextColor(2^math.random(1,14))
textutils.slowPrint("Sleeping...")
term.setTextColor(1)
end
function waitforclick()
term.clear()
term.setCursorPos(1,1)
while true do
os.startTimer(0.5)
local event = os.pullEvent()
if event == "mouse_click" then
term.clear()
term.setCursorPos(19,10)
term.setTextColor(2^math.random(1,14))
print("Waking up....")
sleep(1)
term.clear()
term.setCursorPos(1,1)
term.setTextColor(1)
break
elseif event ==  "timer" then
pie()
end
end
end

waitforclick()