As I was falling asleep a sensed some intrusive / invader forces nearby. This came both from an intuitional level but also from the level of noticing my mind being carried off in an unusual fashion into sleep. It felt as though beings were waiting, praying on me. However, what was strange was that I was already "dreaming" as in elements of my environment were wrong, etc.
The last time I felt a presence like this at night was at the Evergreen State College in the fall of 2005 where I sensed their presence closing in . At the time I had not learned light shielding techniques, or rather was not as aware of lower astral entities, aside from the information that I derived from Yogananda's writings (where he cautions people against the use of mind altering substances as most people are fairly unshielded and tend to first encounter lower level astral beings that can be warring entities when they open up their aura).
I practiced various shielding techniques and once I felt secure I offered as much healing loving energy as seemed appropriate back to the beings.