Rashi: Yes. This is why a live dog is better than a dead lion. Perhaps they will put to their hearts the day of death, and repent.

Brachos 18a: This refers to Tzadikim, who are called alive even when they are dead.

Ibn Ezra: Even Kesilim know that they will die.

Rashbam: Therefore, they should repent before they die.

Ri Kara: This is why "Lev Bnei ha'Adam Malei Ra Holelus" (3) and Sichlus, for they know that all will die - both Resha'im and Tzadikim.

Rid: The living have no other worry. They rejoice in all worldly matters.

Seforno: They have a spiritual or natural awareness that they will die, and try to escape this for a while via the power of nourishing themselves.

Brachos 18a: This refers to all the dead. They do not know what happens here.

Brachos 18b: This refers to Resha'im, who are called dead even while alive -- "v'Atah Chalal Rasha Nesi Yisrael" (Yechezkel 21:30).

Ibn Ezra: Even Chachamim do not know anything in their deaths.

Rashbam: The dead cannot regret and repent.

Rid: The dead do not feel anything.

Seforno: The dead have no natural or spiritual power. They have no way to try to attain life.

Metzudas David: Knowledge would not help the dead, for regret [of their sins] does not help.

Rashi: There is no reward for anything done after death. One who toiled on Erev Shabbos, he will eat on Shabbos (Avodah Zarah 3a).

Rashbam: They have no respite, reward or salvation from their evil deeds.

Ri Kara: They will not benefit from all that they toiled in this world for the sake of this world.

Seforno: Even if they could attain life, they would not have any reward ¹ .

Metzudas David: There is not opportunity to do more Mitzvos, to get reward for action.

Ibn Ezra: They have no hope.

Metzudas David: When a living person regrets his sin or does a Mitzvah, he is remembered for good. This does not apply to Mesim.