Yes you can use this tense form, but usually for something that has a longer duration in time, the act of 'sdraiarsi' is very brief. let me write some examples: a1. La prossima settimana a quest'ora, staro` sdraiato sulla spiaggia a2. La prossima settimana a quest'ora, me ne staro` sdraiato sulla spiaggia (a2) adds emphasis, here the verbal form is pseudo-reflexive, meaning that 'me ne' means: 'in my behalf', 'for my own satisfaction'. b. La prossima settimana a quest'ora, staro` volando verso le spiagge dei Caraibi. c. La prossima settimana a quest'ora, staro` di nuovo in redazione a scrivere i miei articoli per il giornale. Why not the -ando form in your example? The main reason is that your verb is exactly 'stare', so the progressive form would be 'staro` stando', which Italians accurately try to avoid, due to allitteration. The other reason (already mentioned) is the very brief time that the act of 'sdraiarsi sulla spiaggia' takes, if you choose (as you did) /sdraiarsi/ as the principal verb. Greetings and wish you a nice holiday!