be sleepy

I get sleepy.

私は眠くなります

I get sleepy because of last night.

私は昨夜、眠くなります

I get sleepy because I was up late last night.

私は昨夜遅くまで、眠くなります

I get sleepy because I studied late last night.

私は昨夜遅くまで勉強したので、眠くなります

I get sleepy during class because I studied late last night.

私は昨夜遅くまで勉強したので、授業中に眠くなります