0時を過ぎると「もう寝ろよ」と優しくabout:blankに書き出してくれるUserScript

dosleep.user.js

// ==UserScript==
// @name           Do Sleep
// @namespace      http://gist.github.com/saneyuki
// @include        about:blank
// @developper     saneyuki
// ==/UserScript==

(function(){
	var sleep = 0;
	var wakeup = 5;
	var now = (new Date()).getHours();

	if (sleep <= now && now < wakeup) {
		var neroyo = document.createTextNode("もう寝ろよ");

		var wrapNeroyo = document.createElement("div");

		wrapNeroyo.appendChild(neroyo);
		// Text style
		wrapNeroyo.style.fontWeight = "bold";
		wrapNeroyo.style.fontSize   = "5em";
		// box style
		wrapNeroyo.style.height     = "1em";
		wrapNeroyo.style.width      = "5em";
		wrapNeroyo.style.position   = "absolute";
		wrapNeroyo.style.top        = "50%";
		wrapNeroyo.style.left       = "50%";
		wrapNeroyo.style.marginTop  = "-0.5em";
		wrapNeroyo.style.marginLeft = "-2.5em";

		document.getElementsByTagName("body")[0].appendChild(wrapNeroyo);
	}
})();