While some stress stems from overcommitment and limited time, much arises from suspended decisions.
Lingering uncertainty—not merely circumstance—drains mental energy. The inability to prioritize concerns (or relinquish control over uncontrollable elements) leads to a piling of unresolved tasks, each demanding attention until anxiety swells.
Stoics advise understanding your agency (what you can control or change) to make better choices about what can reasonably be solved, then taking action, which relieves the stress of deliberation (procrastination) and turns it into a path to liberation.