Questions & Answers about Я встаю з ліжка рано вранці.
– з is the basic form of the preposition “from” and is used before words starting with a single consonant (here, л).
– зі appears before clusters of two consonants (e.g., зі столу, зі школи) for ease of pronunciation.
– із is an alternate spelling of з used before vowels (e.g., із дому), but з ліжка is the simplest and most common form here.