The "False Sleep" effect lets you recover your Blood Stasis to mitigate loss of health. When attacked, you can counter-attack against nearby enemies, and knock them down. The effect lasts for 5 seconds.
The counter-attack has a range of 5 meters, is ineffective against Super Armor, and can be countered by a Feint. You will be in the Yellow Armor effect during your counter-attack. With increased skill level, you can increase damage of counter-attack.