Do not worry if the human yells at you, for the yell is really that of the Beast in pain. It is important to maintain one's Dignity when around humans so that they will not forget who is the master of the house. It is not known why humans like to sleep when it gets dark, just when the day is young and the masters of the house are fresh and ready for play. It is known, however, that sleeping humans are boring to be around and that they occasionally must be roused to attend to our needs, such as to get fresh food or water or to retrieve a toy that was batted under the sofa. Some will even pretend to be asleep even when we know they're not, hoping we'll give up and go away.
Persistence is the key to success in any case.
This may only result in your being ejected from the bed, but at least you now have the human's attention. If the human is being stubborn, you may have to resort to more drastic tactics, such as ripping down posters, rattling blinds, knocking over and looting a wastebasket, knocking items off the dresser, or singing at the top of your voice. Eventually the human will get up and do what you want, usually employing some bad language while doing so. It is not advised to do this on a regular basis. Discretion is thus strongly recommended.