What is the best singing warm up coz i use to do some humming and lip roll every

Question:

What is the best singing warm up coz i use to do some humming and lip roll every morning ??

I noticed some thing ...my voice use to be not flexible when i get up in the morning but after some hours may be ten hours and more i found that my control so good and i'm so comfotable to do what trill i want to sing easily and my voice sounds so pleasant ..so plz whats going on ????

Best Answer - Chosen by Asker: First thing in the morning is a BAD time to do vocal exercises, but if you must, do the "siren" - simply hum in increasing and decreasing pitch - just like the way a siren sounds.