A safe version of ComputerCraft's sleep function - any events that occur while sleeping will be requeued so none are "dropped."

SafeSleep.lua

local function delay(seconds)
	-- safe version of 'sleep' - will requeue dropped events
	local timer = os.startTimer(seconds)
	local q = {}
	while true do
		local data = {os.pullEvent()}
		if data[1] == "timer" and data[2] == timer then
			break
		else
			table.insert(q, data)
		end
	end
	for i,v in ipairs(q) do
		os.queueEvent(unpack(v))
	end
end