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"When the Prophet (S) did not pray at night because he was prevented from it by sleep or being sleepy then he would pray twelve Rak'ah during the daytime."

When the Messenger of Allah (ﷺ) did not pray at night because he was prevented from doing so by sleep- meaning, sleep overwhelmed him- or by pain, he would pray twelve rak'ahs during the day.

"If the Prophet (ﷺ) did not perform the ritual prayer during the night, because sleep had prevented him, or his eyes had been too weary, during the daytime, he would perform twelve cycles of ritual prayer during the daytime.”