Of course, you're fueling the waking state with these stimulants, and then, of course, it gets to 11 o'clock at night, and the brain says to itself, "Actually, I need to be asleep fairly shortly.
当然，你要保持清醒状态， 就会用这些兴奋剂， 然后，到了晚上11点时， 大脑会说，"啊，实际上， 我需要小睡一会。