without

As-salamu `alaykum. Is it possible to pray without covering my hair, or would the  prayer be invalid? I'm asking because the veil is not allowed in my place of work.thank you!

Assalamu Aleikum. Can a person with a continual incontinence that breaks his wudu read the Holy Quran without wudu? 

As salamu `alaykum  I appreciate this elegant web site about my sweet religion. Can we offer Namaz-e-Tahjud without sleeping? Do we have to sleep, if we want to offer Tahud? If we couldn't sleep for night, the tahjud prayer is not possible. please tell in deep detail. Also Ghous Paak (saint in bagadad) and Khawaja Ajmari worshipped with esha wudu till fajar. Did they offer Tahjud? Thanks a lot.