"Stayed up". ("Stay" is a regular verb.) Note: Only a minority of English grammarians consider that "up" is part of this verb; "up" is more often considered a predicate complement or an adverb. Verbs of this type, however, with separable prefixes, are common in German.
The past participle form of the word "stay" is "stayed."
The past participle form of the word "steal" is "stolen."
The past participle form of the word "use" is "used."
The simple past and past participle are both received.
The past participle form of the word "sing" is "sung."
The past participle form of the word "stay" is "stayed."
The past participle form of the word "steal" is "stolen."
The past participle form of the word "use" is "used."
The simple past and past participle are both received.
The past participle form of the word "sing" is "sung."
The past participle is arisen.
The past indicative form is "did" and the past participle is "done".
The past participle form of "teach" is "taught."
The past participle is cultured. The present participle is culturing.
The past participle form of the word "visit" is "visited."
The word "was" is both a past tense and a past participle of the verb "to be." In the past tense, it shows that something happened in the past. As a past participle, it is used with auxiliary verbs to form various tenses.
Oh, dude, the past participle of "aware" is "aware." It's one of those cool words that doesn't change form in past tense or past participle. So, you can stay aware of that fun fact for your next grammar party.