Windows 7 has Power Management features allowing you to impact power consumption. One feature is Standby (called S3); this puts your PC to bed – during which no code is executed. The resume time from S3 is very fast because the system has been suspended to RAM.
Windows Phone has similar systems to protect battery life. These include Power Saver Mode and Screen Off. Screen Off is Windows Phone’s most similar power management feature to Windows 7 Standby. During Screen Off, your phone is taking a nap and battery life is extended.