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Tldr;

The IEEE 802.11 standard includes power-save mechanisms that allow WiFi devices to conserve power by buffering or queuing frames destined for sleeping devices.

When a client station (receiving device) enters sleep mode, it sends a frame to the access point with a header that contains the power-saving bit, so all frames destined for it are queued.

The standard, however, does not provide explicit guidance on managing the security of these queued frames and does not set limitations like how long the frames can stay in this state.