Ibn Abbas said: "Who remember Allah" refers to remembering Allah – in invocation - following prayers, morning and evening, while lying, and when waking up, and whenever leaving or entering ones home.
Mujahed said: None will be considered among men and women who remember Allah much, unless they remember Allah, standing, sitting and lying.
We ask God in every grief
Then we forget God when grieves are gone
How do we hope prayers are answered?
If we had block the way with sins
An-Nu'man Ibn Bashir reported that the Prophet, may Allah bless him and grant him peace, said: "Supplication is worship". Then he recited: (Call on me and I will answer you). 40:60
Abu Hurayra reported that the Prophet, may Allah bless him and grant him peace, said: "Nothing is dearer to Allah than supplication".
A'isha said: "The Prophet, may Allah bless him and grant him peace, was asked, which type of worship is best? He replied: "A man's supplication for himself".