सपना देख्नु

Yes, but you usually add the adjective 'naramro' (bad) or 'daraulagdo' (scary). 'Maile naramro sapana dekheñ.'

'Dekhnu' is the standard. 'Hernu' is used in some regional dialects but is less common in Kathmandu or formal writing.

You say 'मेरो सपना पूरा भयो' (Mero sapana pura bhayo).

No, it also means ambitions and goals for the future, just like in English.

Because 'dekhnu' (to see) is a transitive verb, and in Nepali, transitive verbs in the past tense require the agentive marker '-le' on the subject.

Technically yes, but since you are asleep, you wouldn't say it! You would say it about a daydream or a long-term goal you are currently pursuing.

The opposite is 'Vipana' (विपना), which means the waking reality.

Nepali nouns don't have grammatical gender in the same way as Spanish, but 'Sapana' is treated as a neutral/masculine noun for verb agreement.

There isn't a direct literal translation used as commonly as in English, but you can say 'राम्रो सपना देख्नुस्' (Ramro sapana dekhnus).

Yes, 'Sapana' is a very common female name in Nepal.

It means 'to weave a dream', which is a poetic way of saying you are building a big plan for your life.

Yes, dreams are often seen as omens or messages from the subconscious/divine.