want to sleep

I can understand it. Sometimes when you are full after the lunch, you will feel sleepy easily. And it is easy to make a mistake when you are sleepy at work. Even though, some companies don't allow the employees to have the nap at noon after the lunch. Perhaps you can try to have a very short nap in the bathroom. It will be a bit helpful. I love China

most times, a nap in the day is good to the body. sometimes, it is referred to as power nap. even a 15-20 minutes nap would keep you from being sleepy the whole afternoon. can't you do the napping during your lunch break? i think, in most countries, lunch break is around one hour. if that is absolutely banned, try getting 6-8 hours sleep at night, instead.