The Standard Sleeper Cache is more difficult than the average data or relic site. It has a weak signal strength, stronger system hack defenses, environmental hazards, sleeper sentries, hidden loot containers, and a few puzzles that will challenge even the more experienced explorers.
Standard Sleeper Cache sites can drop polarized weapon bpc, storyline module bpc, sleeper items, and valuable science skill books. The sites will also drop random meta level loot on some containers.