I just read about powernap here but don't know how to install it..
Download and untar was simple:
axel https://launchpad.net/powernap/trunk/2.20/+download/powernap_2.20.orig.tar.gz && tar -xvf powernap_2.20.orig.tar.gz
Content of powernap_2.20.orig.tar.gz:
/powernap-2.20
|-- /actions
| `-- ..
|-- /bin
| `-- ..
|-- /man
| `-- ..
|-- /powernap
| `-- ..
|-- /powerwake
| `-- ..
|-- /sbin
| `-- ..
|-- action
|-- ChangeLog
|-- config
|-- config_migrate.py
|-- DESIGN
|-- powernap.spec
|-- powernap-ethtool
|-- powerwake_completion
|-- powerwake.conf