When I saw that a fellow Japanese language student wrote: "僕は毎日に八時頃起きます。"
According to Wiktionary 毎日 is already an adverb. I would personally say
"僕は毎日八時頃起きます。"

Could you explain the difference between 毎日に and 毎日?
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2021-03-10T15:59:26.417
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question
grammar particle-に
Difference between 毎日に and 毎日
毎日 is never used with に. The same thing applies to
毎週、毎月、毎年、明日、昨日、今朝、今晩、今日、今、さっき、先週、来週、今週 etc.

In contrast, weekdays are with に (月曜日に、火曜日に etc.), and also when talking about
time （５時に、３時半に etc.）.

I guess に is optional for 午前中 and 午後. I'd personally use 午前中 with に and 午後
without.
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2021-03-10T20:24:33.160
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answer