after praying namaaz-e-tahajud wat do u pray, is it the normal tasbee of subha nala allhumdulila and allah ho akbar or sumat else. and its 2 rakaats rite + wats the proper wording for niyaaat!!
jazakallah khairum
peace 
after salat-ul Tahajudd you are suppose to pray salat-ul Witr,
hope this helps
Re: ? on namaaz-e-tahajud
wasalam…
here r some points woth noting…
namaz e tahujud rikaats ranges from 4-12 …so try to offer atleast 4 rikaats…
well yes normal tasbeehat (masnoon ones)…plus tilawah…
also if ur shaikh has given u some zikr etc…then it is the best time to do that…
Also TIME OF TAHUJJUD is to be kept in mind…
best time is just for sehri in ramdan…
in normal days if it is hard to wake at night then it is allowed that before witr u can pray 4 rikaats with the niyat of qayamull lail (tahujjud)…
as tahujjud time starts by then…
NAFIL NAMAZOON MAIN NIYAAT ZABAN SAY KAHNA ZAROORI NAHIN HAY…AAP TAHUJJUD KAY LIYE HE KHARAY HOA HAIN…THATS THE NIYAT
REMEBER ME IN UR PRAYERS
WASALAM
BAO