I felt so sleepy I couldn't stop yawning.
我

困,止不住
打呵
。
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We know it's associated with sleep and boredom, but that doesn't explain why it happens, and like most human behaviors, if you stop and think about yawning long enough it starts to become a really, really weird thing to do.
我
知道这与睡眠、感到无聊有
,
这并不能解释为什么会发生这种情况,就像大多数人的行为一样,如果你停下来想打哈欠的时间足够长,它就会变成一件真正奇怪的事情。