I guess Annapurna just tried to say that lazyness is not the message of praxticing. Many people have the believe that it is easy doing the homeless life with less responsibilities accept the responsibility to defeat ones own defiments.
That is acctually much more work and needs much more discipline as other work, which is at least nothing but running away from the real duties.
So "Why getting up in the mornig? What for?" can be answered maybe in: 1. to defend your unwholesome habits, 2. to train your mind not to run after your present feelings 3. to be as long as possible aware of what you are doing (sleeping a short time and even only once a day is maybe more importand) Practical maybe: to find a reason why to abstain from unwholesome actions till late in the morning; not wasting energy if one can use daylight; don't miss a single moment of another wonderful day.
Some good advices (especiall for layman) are found in the Sigalovada Sutta
which might be the reason why one thinks that he needs to sleep long:
(b) "There are, young householder, these six evil consequences in sauntering in streets at unseemly hours:
(i) he himself is unprotected and unguarded,
(ii) his wife and children are unprotected and unguarded,
(iii) his property is unprotected and unguarded,
(iv) he is suspected of evil deeds,
(v) he is subject to false rumours,
(vi) he meets with many troubles.
(f) "There are, young householder, these six evil consequences in being addicted to idleness:
"He does no work, saying:
(i) that it is extremely cold,
(ii) that it is extremely hot,
(iii) that it is too late in the evening,
(iv) that it is too early in the morning,
(v) that he is extremely hungry,
(vi) that he is too full.
"Living in this way, he leaves many duties undone, new wealth he does not get, and wealth he has acquired dwindles away."
I guess the whole sutta is worthy a read and a pound of good advices for everybody. Wether he for this existence, the next or even to get out of the circle.
What wakefulness for a Monk means is listed in the Nanda Sutta: About Nanda
"This is Nanda's devotion to wakefulness: There is the case where Nanda during the day, sitting & pacing back & forth, cleanses his mind of any qualities that would hold the mind in check. During the first watch of the night, sitting & pacing back & forth, he cleanses his mind of any qualities that would hold the mind in check. During the second watch of the night, reclining on his right side, he takes up the lion's posture, one foot placed on top of the other, mindful, alert, with his mind set on getting up. During the last watch of the night, sitting & pacing back & forth, he cleanses his mind of any qualities that would hold the mind in check. This is Nanda's devotion to wakefulness.
1. First watch: dusk to 10 p.m.
2. Second watch: 10 p.m. to 2 a.m.
3. I.e., either as soon as he awakens or at a particular time.
4. Last watch: 2 a.m. to dawn.
I would not recommend this for people full involved in worldly business, even if one is handling much responsibility like a driver or working on or with heavy equipment. 6 h of sleep are good and in the summertime one would be able to enjoy the whole day, if this 6 h are not just placed in the afternoon to get fit for the next events.