Player::Update in player.cpp

if (HasFlag(PLAYER_FLAGS, PLAYER_FLAGS_RESTING))
    {
        if (roll_chance_i(3) && _restTime > 0)      // freeze update
        {
            time_t currTime = GameTime::GetGameTime();
            time_t timeDiff = currTime - _restTime;
            if (timeDiff >= 10)                             // freeze update
            {
                _restTime = currTime;

                float bubble;
                if (HasSpell(90168)) // If has Inner Peace give double rest exp.
                {
                    bubble = 0.125f * sWorld->getRate(RATE_REST_INGAME) * 2;
                }
                else
                {
                    bubble = 0.125f * sWorld->getRate(RATE_REST_INGAME);
                }
                float extraPerSec = ((float)GetUInt32Value(PLAYER_NEXT_LEVEL_XP) / 72000.0f) * bubble;

                // speed collect rest bonus (section/in hour)
                float currRestBonus = GetRestBonus();
                SetRestBonus(currRestBonus + timeDiff * extraPerSec);
            }
        }
    }