@Sarah TeeSleep issues maybe just because your body is adjusting to something new (amlodipine). for me it normally takes a month to adjust to a new med.
I also urge caution with playing around with dosing with this med as it is not a fast acting drug so it needs to build up in your system.
In other words, it takes about 30 to 50 hours for your body to get rid of half of a dose of amlodipine. It usually takes about five half-lives for a drug to leave your system entirely. For amlodipine, this means the drug will stay in your system for about 10 days after your last dose.