For how peptides engage targets and relay signals generally, see how signaling peptides work and the science behind cellular signaling
Whether any of that holds is a question about evidence, and the evidence is genuinely contradictory rather than merely thin
However, it can also be used at night, especially if your routine includes exfoliants or retinoids in the morning
Proper storage practices are discussed in greater detail in our guide to How to Store Research Peptides: Stability, Temperature & Shelf Life, which covers refrigeration, freezing, transportation, and long-term handling considerations for a wide range of research peptides
Finken MJ, Meulenbelt I, Dekker FW, Frolich M, Walther FJ, Romijn JA et al