stand up
In Italian, 'alzarsi' is the verb used to express the action of standing up. It is a reflexive verb, meaning it refers back to the subject performing the action. For example, 'Mi alzo' means 'I stand up'. 'Alzarsi' can also be used in a broader sense to mean 'to get up', such as from a chair or bed.
I have to get up very early tomorrow
In this sentence, 'alzarsi' is used to express the action of waking up from sleep, in this case, it signifies waking up very early in the morning.
I can't get up after a sleepless night
Here, 'alzarsi' is used to illustrate the difficulty of waking up or getting out of bed after a night without sleep, reflecting the physical action of getting up which is difficult due to lack of sleep.
She loves getting up with the sun
In this context, 'alzarsi' is used to describe the habit of waking up early in the morning, specifically at sunrise. It conveys the sense of waking up along with the start of the day.