Yes no problem. Since it is last third of night you can ask plenty of duaas and this is the time of seeking forgiveness.

Read more

No, it is not permissible and it doesn’t count. They do this in prayer, their prayer is invalid.

Read more

In loud Rakah, you may recite only the Fatiha but it is not mandatory. In silent Rakah, you must recite the Fatiha and if there is time, you can recite something else from the Quran.

Read more