I rarely shut down. I use sleep to the S3 sleep state which enters a low power state that only holds the ram data. sleep/wake takes only a few seconds.
S3 is selected in the bios. If you mean sleep/suspend without a hiberfile, windows will want to keep ram active, and you need to enable that.
One gotcha... The hiberfile is hard to get rid of, if you have ever used it. The space will still be there, even if you turn hibernation off. It is more of an issue with a small ssd vs. a hard drive. Some google work will show you how to get rid of it.