Sat Sangat Ji,
I used to have problems also when i tried at the age of around 26/27...used to make excuses when the alarm went off...and even if i got up, i would fall asleep very quickly. Don't feel bad about this...now when i look back it was all part of the evolution process...making the effort, failing, trying again...your love for God/Guru gets stronger...keep doing your ardaas. When the time is right, you'll be doing it with no problems whatseover.
Now (at the age of 33) i have been doing Daily Amrity Vela Naam Simran for 2.5 hours for the past 3 months....and i dont even use an alarm clock.
I do an ardaas before sleep asking Guru Ji to gently wake me up when 'HE' wants me to do Simran and MArit Vela....and you know what, you get woken up at the right time...for me i get to sleep at about 10.30/11pm, and get genty woken at around 2.30/3am everynight.
I couldnt sit for longer than 30 minutes doing simran, now 2.5 hours goes very quickly ... never give up...everytime we fall, we come back stronger the next time. Do not bother with alarm clocks...All is God, there is no Ego in this...only He exists and He will wake you up when its the best time. And don't feel upset if on the odd day you dont get woken up...sometimes God knows when you need your sleep more.
Through your Naam Simran, and Guru Ji's grace...when you start to get your own personal experience of God, you'll never ever look back again