Everyday I get up very early.
Every day I get up very early.
Every day, written as two words, means ‘each day’ and tells us how often something happens: ‘I check my email every day.’
Everyday, written as one word, is an adjective meaning ‘ordinary’, ‘normal’ or ‘used regularly’. It goes before a noun: ‘These are my everyday clothes.’ ‘Computers are part of everyday life.’