A solid choice — #15 of 31 Alpaca ranks #15 of 31 fabrics for night sweats. It is a good fabric for this. Ranked on breathability and moisture absorption, penalised for warmth and weight. The top pick is Linen.
Alpaca measures 58/100 for breathability, 14% moisture regain, 88/100 warmth, at 220 gsm. For night sweats, modest breathability and strong moisture absorption decide comfort — and its higher warmth risks trapping heat against the skin.